| S20.341 | External constriction of right front wall of thorax | NON-BILLABLE CODE |
| S20.341A | External constriction of right front wall of thorax, initial encounter | BILLABLE CODE |
| S20.341D | External constriction of right front wall of thorax, subsequent encounter | BILLABLE CODE |
| S20.341S | External constriction of right front wall of thorax, sequela | BILLABLE CODE |
| S20.342 | External constriction of left front wall of thorax | NON-BILLABLE CODE |
| S20.342A | External constriction of left front wall of thorax, initial encounter | BILLABLE CODE |
| S20.342D | External constriction of left front wall of thorax, subsequent encounter | BILLABLE CODE |
| S20.342S | External constriction of left front wall of thorax, sequela | BILLABLE CODE |
| S20.343 | External constriction of bilateral front wall of thorax | NON-BILLABLE CODE |
| S20.343A | External constriction of bilateral front wall of thorax, initial encounter | BILLABLE CODE |
| S20.343D | External constriction of bilateral front wall of thorax, subsequent encounter | BILLABLE CODE |
| S20.343S | External constriction of bilateral front wall of thorax, sequela | BILLABLE CODE |
| S20.344 | External constriction of middle front wall of thorax | NON-BILLABLE CODE |
| S20.344A | External constriction of middle front wall of thorax, initial encounter | BILLABLE CODE |
| S20.344D | External constriction of middle front wall of thorax, subsequent encounter | BILLABLE CODE |
| S20.344S | External constriction of middle front wall of thorax, sequela | BILLABLE CODE |
| S20.349 | External constriction of unspecified front wall of thorax | NON-BILLABLE CODE |
| S20.349A | External constriction of unspecified front wall of thorax, initial encounter | BILLABLE CODE |
| S20.349D | External constriction of unspecified front wall of thorax, subsequent encounter | BILLABLE CODE |
| S20.349S | External constriction of unspecified front wall of thorax, sequela | BILLABLE CODE |
